| Author |
Message |
mi_dach
Joined: Dec 17, 2005
Posts: 133
Location: Sweden
|
 Posted: Fri Mar 23, 2007 3:11 am Post subject:
modulation matrix |
  |
|
Have you guys any suggestions or examples for how I can make a nice modulation matrix? I'd like to do something thats 8x8 or 8x12, one of those boards where you can insert a little pin would be nice... A huge patchbay of telejacks or even banana plugs seems extreme...
It might be useful to bear in mind that this is for a digital piece of gear, and will not contain analog signals. I want to scan the matrix with a microcontroller and send midi to max/msp when the matrix changes.
Sugggstions welcome!! |
|
|
Back to top
|
|
 |
Pehr
Joined: Aug 14, 2005
Posts: 1307
Location: Björkvik, Sweden
Audio files: 2
|
|
|
Back to top
|
|
|
mi_dach
Joined: Dec 17, 2005
Posts: 133
Location: Sweden
|
| Posted: Fri Mar 23, 2007 5:47 am Post subject:
|
|
|
That's the kind of matrix I'd really like, but unfortunately it doesn't say much about how to get ahold of one.
Our recording was thrashed by the way, my soundcard driver had some sort of problem and made a lot of irritating static over everything. |
|
|
Back to top
|
|
|
Pehr
Joined: Aug 14, 2005
Posts: 1307
Location: Björkvik, Sweden
Audio files: 2
|
|
|
Back to top
|
|
|
Mikmo
Joined: Dec 01, 2005
Posts: 150
Location: Copenhagen - Denmark
|
|
|
Back to top
|
|
|
Funky40
Joined: Sep 24, 2005
Posts: 875
Location: Swiss
Audio files: 1
G2 patch files: 5
|
| Posted: Fri Mar 23, 2007 3:00 pm Post subject:
|
|
|
| mi_dach wrote: | That's the kind of matrix I'd really like, but unfortunately it doesn't say much about how to get ahold of one.
|
it's sayd:
it's Ghilmetti, ahh i see, Mikmo has edited it.
yeah it's a swiss company.
i have the 10x10 here with 3mm grid / Tip: they have old stocks which are much much cheaper ca. 47.- CHf ( = ca. 30€ ) buit this is without plugs.
and only for the one with 3mm grid.
each single resistorplug is 6 CHF ( = ca3.8 € )
But:
when you just need it for digital signals there is an other one i found around here in a electronic shop.
It is 8x8 ,. 3mmm grid, and it comes with diodepins ( 20pieces.)
It's also a ghielmetti one.
there a couple of them remaining in that shop. I can get you one.
this are 24.50 CHF incl. diodepins ( = around 15€ )( shipping is 2 or 5€ when remember right )
Pitures:
http://www.twango.com/media/Funky40.public/Funky40.10061?sort=5
http://www.twango.com/media/Funky40.public/Funky40.10062?sort=5
http://www.twango.com/media/Funky40.public/Funky40.10063?sort=5
( edit: i contactet ghilmetti to ask about them.
this are since a few Years out of production.
We have here not much remaining of those in that shop.
I don't go and buy all away.
Maybe me or other dIYers need some one day too .
there are around 12 left. so if 2 or 3 People need one i'll get i for you .
As sayed: this have doide pins and are for digital signals only)
| Quote: | | I guess one could search the nearest airplane junkyard |
there is a kind of electric gear that has such thing built in ( little ones).
afaik it's aprinter or copymachine.
there was a thread in the german synthesizerforum someone posted this tip |
|
|
Back to top
|
|
|
ian-s
Joined: Apr 01, 2004
Posts: 2672
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 626
|
| Posted: Fri Mar 23, 2007 4:16 pm Post subject:
Re: modulation matrix |
|
|
| mi_dach wrote: | | It might be useful to bear in mind that this is for a digital piece of gear, and will not contain analog signals. I want to scan the matrix with a microcontroller and send midi to max/msp when the matrix changes. |
Why not do a matrix of 3mm LEDs, multiplexed by the micro. Then you could use a 'light pen' to insert or remove virtual pins. Would be very inexpensive and allow you to store patches. Also the 'power on' self test sequence could be made to look quite cool. And no pins to loose.
You would just need to ensure that the LED off state still has a very narrow pulse so it can still be detected by the photo diode in the pen.
Or maybe a row of small push switches on both the x and y axis. It seems that it would make connecting the right source to destination easier, if the buttons were next to the row/column labels. |
|
|
Back to top
|
|
|
mi_dach
Joined: Dec 17, 2005
Posts: 133
Location: Sweden
|
| Posted: Sat Mar 24, 2007 4:23 am Post subject:
Re: modulation matrix |
|
|
| g2ian wrote: | | Why not do a matrix of 3mm LEDs, multiplexed by the micro. Then you could use a 'light pen' to insert or remove virtual pins. Would be very inexpensive and allow you to store patches. Also the 'power on' self test sequence could be made to look quite cool. And no pins to loose. |
This is a very sexy sounding idea, and I will probably build one just to see what it is like. But really, I think I want the hardware with pins because of the feel.. thats the most important part for me. I aim to build a sort of modular hardware interface to drive a modular software machine (max/msp)
Funky40: The 8x8 diode pin version sounds wonderful, I'd be very happy if you can get one of them for me at 20€ I think is very reasonable, plus a little beer money of course  |
|
|
Back to top
|
|
|
Funky40
Joined: Sep 24, 2005
Posts: 875
Location: Swiss
Audio files: 1
G2 patch files: 5
|
| Posted: Sat Mar 24, 2007 7:02 am Post subject:
|
|
|
@mi_dach
ok, i get you one in the next Days.
I'll PM you then
i drink no beer, and good chocolate we have here allready. 
It's fine so, just what i pay
| Quote: | | I aim to build a sort of modular hardware interface to drive a modular software machine (max/msp) |
oh, that sounds interesting |
|
|
Back to top
|
|
|
para
Joined: Oct 16, 2006
Posts: 276
|
| Posted: Sat Mar 24, 2007 3:31 pm Post subject:
Re: modulation matrix |
|
|
| g2ian wrote: | Why not do a matrix of 3mm LEDs, multiplexed by the micro. Then you could use a 'light pen' to insert or remove virtual pins. Would be very inexpensive and allow you to store patches. Also the 'power on' self test sequence could be made to look quite cool. And no pins to loose.
You would just need to ensure that the LED off state still has a very narrow pulse so it can still be detected by the photo diode in the pen. |
a "how to" for this would be great. it sounds like a wonderful idea but i have no clue how to do this. the push botton idea is pretty cool too, i'm going to have to try that, thanks. |
|
|
Back to top
|
|
|
ian-s
Joined: Apr 01, 2004
Posts: 2672
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 626
|
| Posted: Sat Mar 24, 2007 5:09 pm Post subject:
Re: modulation matrix |
|
|
| para wrote: | | a "how to" for this would be great. |
Just thinking aloud 
To drive a large number of LEDs with a micro, you use time division multiplexing. So for a 8x8 matrix, only up to 8 are on at any given time. The micro sequences rapidly through the rows and persistence of vision makes it appear that they are all on.
If you put a photodiode in the end of a pen/stylus and connect the signal back to an input pin on the micro, the micro can tell which LED you are pointing at, by the timing of the pulse. The Pulse itself would need to occupy a small portion of the possible 'on' signal.
So the only extra hardware required would be the photodiode + opamp for gain and signal conditioning. All you need to add to the software is the extra pulse sequentially on each column. The row addressing is already taken care of by the multiplexing.
This is all just theory but it is not very different to how the light pen worked on a Fairlight CMI.
The other idea of using switches on the labels might be more practical. Press a row switch and that row blinks at half brightness, press a column switch and the connection is made/broken. I am thinking that although the idea of a pin matrix seems cool. Inserting a pin in the right hole might not be that easy in practice. I have never used a synthi so I can't say for sure, just based on comments from people who have tried it. |
|
|
Back to top
|
|
|
para
Joined: Oct 16, 2006
Posts: 276
|
| Posted: Sat Mar 24, 2007 11:21 pm Post subject:
|
|
|
"software " i am pretty far from working with software programmed chips. if someone were to put together a kit with the pre-programmed chip i'd definitely buy one or two, but thats about as far as i'm going to get in that direction for a while.
steven |
|
|
Back to top
|
|
|
mi_dach
Joined: Dec 17, 2005
Posts: 133
Location: Sweden
|
| Posted: Sun Mar 25, 2007 1:21 am Post subject:
|
|
|
| The problem with using the lightpen idea is that the on pulse is always visible, even with really short on times... the human eye is very very sensitive. Not sure how it's been done before now, there must be some extra little trick involved somewhere |
|
|
Back to top
|
|
|
amos_joseph
Joined: May 09, 2005
Posts: 50
Location: Lincoln, NE
|
|
|
Back to top
|
|
|
Funky40
Joined: Sep 24, 2005
Posts: 875
Location: Swiss
Audio files: 1
G2 patch files: 5
|
| Posted: Wed Mar 28, 2007 7:21 am Post subject:
|
|
|
@mi_dach
i bought one, you got PM |
|
|
Back to top
|
|
|
|
Forum index » DIY Hardware and Software
FAQ
Calendar
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
Chat Room
